In order to get information about L.hongkongensis contamination in fish,1097 samples of various species of fish including grass carp(247),bighead carp(248),other freshwater fish(431)and marine fish(171)were collected from five coastal provinces,Zhejiang,Guangxi,Guangdong,Hebei and Fujian in China within the period from August to October 2005.L.hongkongensis was isolated solely from freshwater fishes(7.69% of grass carp(19/247),0.81% of bighead carp(2/248)).The organism was not found in marine fishes.It is concluded that L.hongkongensis needs to be particularly monitored in the market of fresh water fishes.